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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Tin foil test

You can experiment with foil and a ground strap. I have an Allo Volt amp that came with a SMPS that is very noisy. I wrapped a cable in foil and grounded it and kept doing that until I found the noisy cable. It turned out to be the power cable. I couldn't get rid of all the noise so I bought a used linear supply.

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